Fan or ventilator.



No. 884,876. PATENTED APR. 14, 1908. S TIMOKHOVITCH FAN OR VENTILATOR. APPLIQATION FILED MAR. a, 1900.

2 SHEETS-SHEET 1.

WITNESSES:

S. TIMOKHOVITCH.

FAN 0R VBNTILATOR. APPLICATION FILED MARI 8, 1906.

. W/TNESSESI M IVENTOR 7 I J I I I 1 p,

ATTORNEYS.

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PATENTED APR. 14, 1908.

2 SHEETS-SHEET 2.

UNITED STATES PATENT OFFICE.

SERGIUS TIMOKHOVITCIL OF MOSCOW, RUSSIA.

FAN OB VENTILATOR.

Application filed March s, 1906.

To all whom it may concern:

Be it known that l, SERGIUs TIMOKHO- vITcH, a subject of the Emperor of Russia, and a resident of Moscow, Russia, (whose post office address is 24 Miassnitzkaya, Moscow) have invented certain new and useful Improvements in Fans or Ventilators, of which the following is a specification.

My invention has for its object improvements in fans or ventilators by which a noiseless motion of their blades is attained.

The fans now in use with blades directly attached to the motor (especially electromotor) axle produce a very annoying noise, which makes a serious inconvenience when these fans are applied in dwelling rooms, besides their mechanical effect is very low. Both these defects of existing fans are due to the excessive speed of rotation of their blades, and to the small dimensions of these latter.

Then ventilators are combined with motors in such a way, that these latter are mounted on separate sliding frames, the noiseless actionand a higher mechanical effect can be attained by duly proportioning the diameters of the sheaves on the motor and on the fan, so that the blades of given dimensions might'rotate with a most favorable speed for their noiseless action. Such an arrangement, besides being complicated, requires that the tension of the transmitting belt should be continuously controlled, which can hardly be realized especially for fans of small size. Besides in using alternate cur- I rent eleotromotors the normal speed can be imparted to the ventilator blades but successively (step by step), which requires the use of conical transmission sheaves.

In order to avoid the above mentioned inconvenience, I use a frictional transmission of a peculiar character between the motor and the ventilator blades, and I mount, for the sake of convenience, the whole apparatus on the body of the motor, but it is obvious, that the ventilator and the motor can also be mounted separately.

The essential peculiarity of my arrangements consists in that the necessary surface adhesion between the friction surfaces for actuating the ventilator is secured by the weight of one of the sheaves and of the blades attached thereto, etc., without the aid of any intermediate art requiring to be constantly controlled. i vith such an arrangement and by reducing the speed Specification of Letters Patent.

(number of revolumission.

Patented April 14, 1908. Serial No. 304,960.

tions) and by increasing accordingly the size of the blades, a considerably higher mechanical effect and a noiseless action of the ventilator are attained, the transmission of this kind requiring no control and having no necessity of using conical sheaves with alternate current motors or graduated resistances (rheostats) with constant current motors.

On the accompanying drawings, Figure 1 represents a side view partly in section of one form of a ventilator provided with my improved transmission. Fig. 2 is a like view of a modification. Fig. 3 is a front view of another modification.

A is the motor having on its shaft a frictional sheave a; p is a supporting arm pro vided at its end with a guiding sleeve Q for the stem 9 of the bearing D for the axle d of the fan. The blades B of the fan are attached to the outer end of the axle d, and on the inner end of this axle is secured a frictional sheave b of a larger diameter than the sheave a. The weight of the sheaveb with blades B and of the bearing D with its stem 9 is so calculated that it is fully sufficient to realize a proper amount of friction between the sheaves a and b in order to impart to the blades such maximum speed of rotation at which no noise be yet produced. Owing to the frictional transmission this normal speed of rotation is imparted to the blades progressively, so that the motor will not be overloaded in the moment of closing the circuit (if electromotor is used).

In ventilators of small size the weight of the stem 9 with the bearing D can be balanced by a lever Z fulcrumed on the pin t and supporting by one of its ends the stem while its other end (arm) is provided with a counterweight q.

The Fig. 2 represents a modification difl'ering from the arrangement shown on Fig. 1 by that the blades B are attached directly to the sheave l) and the hearing this sheave b, the bearing D being supported in its normal position by a lever 19 fulcrumed on the pin t and having a counterweight Q at its other arm (for ventilators of small size).

It is obvious that the bearing D can be also supported in this modification by a fixed arm (such as p on Fig. 1) with a guiding sleeve (such as Q) arranged between the sheave b and the motor 7L.

The Fig. 3 represents a front view of another modification of the frictional trans- In this case the bearing of the ven- D is inside of I iii spite of any tilator aXlevcZ is also supported by a lever p fulcrumed on the pin 13 and having on its other arm a counterwei ht q (for ventilators of small size). The hu of the blades B is secured'on the outer end of the axle d, and on its inner end a sheave b is attached, this latter being connected to the sheave a on the motor shaft by a belt m. Owing to the inclined position of the supportin axle d of the blades tends to fall away from the sheave a and consequently to maintain a constant tension of the belt m, thus securing a regular Working of this transmission in stretching of this latter during the Work etc.

It is to be observed that all these improvements can be applied as Well to the electromotors as to other rapidly turning steam and hydraulic mo tors.

The chief advantages of the improved fans or ventilators are: the highest possible mechanical effect and a noiseless Working, to-

gether with the arrangement of all translever 10 the J mission par ts (fri 1 i 1 Wheels transmission) on the m tor itself, the transmission requiring no Watching or control. Besides the frictional transmission in l combination With alternate current electromotors excludes the possibility of overloading the motor in putting it into Work and of burning of the safety plug etc.

I claim as my invention:

A ventilator or fan comprising a motor, and its shaft, a fan Wheel, means for actuating the Wheel from the motor shaft, said 1 means being controlled by the Weight of the Wheel, and counter-balancing means for the Wheel.

In testimony whereof, I have signed my name to this specification in the presence of tWo subscribing Witnesses.

SERGIUS TIMOKHOVITOH.

Witnesses:

GUs'rAvE E. HASTINGS, NICOLAS FIGANOF. 

